Kaz, Star, Adrianna,
and Dante are on a marine expedition for the summer, diving to explore
an underwater habitat that's just been altered by a seismic event.
What they find, though, is much more than fish -- it's sunken treasure.

The "adults"
in the expedition are trying to convince Kaz and the crew that their
sunken treasure ship is nothing more than a prop from an old movie.
When they figure out that it is real, they also realize that it
will take ingenuity and teamwork to get back what's rightfully theirs.

The kids found
sunken treasure. The adults want to keep it for themselves. But
there's a chance that both will lose it if they don't act fast.
Our heroes learn that trust is more vital than air in the thrilling,
shark-infested conclusion to this underwater trilogy.

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